Photochromic photosensitive composition
US4485168A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Apr 21, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/163
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photochromic photosensitive composition contains a benzothiazolinospiropyran compound represented by the general formula: ##STR1## wherein R.sub.1 represents an alkyl group containing 1 to 10 carbon atoms, R.sub.2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R.sub.3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms, and R.sub.4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, dissolved or dispersed in a bisphenol A type polyether resin for enhancing thermal stability of the compound in a colored state. Addition of a phenol to the composition serves to further enhance the heat stability. As compared with conventional photochromic compositions, this photochromic photosensitive composition is thermally extremely stable in a colored state, and the developed color image can be stored for an enough long time to be suited for long-time recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.